Here is the explanation:
BROKER_POOL_OVERLOADED
Unable to launch from Pool ${DesktopId} for user ${UserDisplayName}: All responding machines are currently in use
Found it in the documentation:
VMware View 5.2 Documentation Library
It seems that there are more users then available desktops.
One reason for this is that the desktop is still logging off, maybe a roaming profile or a application that is in a hung state.
Try to investigate what could be interfering with the logout or tweak the setting and close applications faster at logout.
// Linjo